Refer to Troubleshooting, "Oil Pressure Is Low". At the heart of every mass flow sensor is a MEMS based calorimetric microsensor, which measures the gas flow using the thermal measurement principle. Continue with this procedure after the low oil pressure condition is resolved. It consists of a tubular housing with flow straightener, sensor protection, and sensor module. A mass (air) flow sensor (MAF) is a sensor used to determine the mass flow rate of air entering a fuel-injected internal combustion engine. Repair: Replace actuator (6) and valve assembly (4). Mass air flow sensors are one of the essential components of an electronic fuel injection systems. This screw controls the air-fuel mixture by letting a metered amount of air flow past the air flap, thereby leaning or richening the mixture. The tricky thing with some of these types of faults is that you can have a mass air flow sensor concern without triggering the check engine light. [5], These vortices can either be read directly as a pressure pulse against a sensor, or they can be made to collide with a mirror which will then interrupt or transmit a reflected light beam to generate the pulses in response to the vortices. Each terminal must be clean and dry. Note: The communications adapter must be communicating on both data links in order to perform this procedure. Note: Refer to Troubleshooting, "Sensor Signal (Analog, Active) - Test" for codes that relate to the sensors. Replace valve assembly (4) if the flapper rotates smoothly. Inspect the wiring between the P2 connector and the harness connector for the coil. Laminar flow conditions are present in a gas when the Reynolds number of the gas is below the critical figure. Adjustments to the fuel mixture are necessary to keep a vehicle running smoothly. Many technicians in the field use a tap test with very conclusive results. Also, you may also want to inspect all of the cgi lines for leaks. The use of an oscilloscope is strongly recommended to check the output frequency of these sensors. A hot wire burn-off cleaning circuit is employed on some of these sensors. Inspect the piping between the outlet of the DPF and the venturi. They are extremly reliable and long-term stable and are free from zero-point drift. Run the "Air System Verification Test". Test Step 9. Run the "Air System Verification Test". There are several sensors there. Then, perform the "Air System Verification Test". CGI Differential Pressure - This is the pressure drop across the venturi. conditions in the open literature. The membrane has a thin film temperature sensor printed on the upstream side, and one on the downstream side. The coil creates a magnetic field that is detected by the actuator. They are not included on the manufacturer’s scheduled maintenance list of things to replace based on mileage, like spark plugs or filters. 520192-16 : CGI Mass Flow Rate : High - Moderate Severity (2) The flow of clean gas is consistently excessive. Look for these problems: Run the "Air System Verification Test". The sensor group produces electrical signals that indicate the values of the following parameters: CGI Temperature - This is the temperature of the clean gas in the duct. The ECM uses the signals to determine the mass of the clean gas that is flowing into the turbocharger. The air mass details are required in order to balance correct amount of fuel mass to the vehicle engine. Determine if either of the following codes are logged: Test Step 6. The difference between the upstream and downstream temperature indicates the mass airflow. Refrigerant mass flow rate is an important measurement for monitoring equipment performance and enabling fault detection and diagnostics. The mass airflow sensor measures the mass of the air that is entering the vehicle, and sends the information to the car’s computer management system. The sensor is on the drivers side of the engine under the crankcase breather canister. Observe the pressure readings on the gauges. The hot film MAF sensor works somewhat similar to the hot wire MAF sensor, but instead it usually outputs a frequency signal. They can remain in service indefinitely as long as they continue to function correctly. Determine the logged code for the CGI system. This condition may cause other problems with the CGI system. Repair: Carefully clean the venturi. Repair any problems. CGI Mass Flow Rate : High - Least Severe (1) The flow of clean gas is consistently excessive. They measure the amount of air entering the engine, or the air flow. The location of control group (4) and (6) and temperature sensor (5) depends on the chassis. Unlike the vane meter's paddle sensing element, the hot wire responds directly to air density. Check the Wiring for an Open Circuit. Repair: Make the necessary repairs. The best way to track it down is to follow the small CGI lines from under the turbos that connect to the big CGI line. Carefully follow this procedure in order to identify the root cause of an intermittent wiring problem. An emerging technology utilizes a very thin electronic membrane placed in the air stream. Inspect the holes on the inside of the venturi. Check the Wiring for a Short Circuit, Test Step 5. Verify that the CGI flow is within the acceptable range during the test. The Innovative Sensor Technology IST AG thin-film mass flow sensors offer solutions for a wide variety of flow applications. The flapper is connected to the actuator's shaft. Repair: Perform the following procedure: Test Step 2. The drag force depends on air density (air density in turn depends on air temperature), air velocity and the shape of the vane, see drag equation. The frequency of the resulting pattern is proportional to the air velocity. Many VAF sensors have an air-fuel adjustment screw, which opens or closes a small air passage on the side of the VAF sensor. The original -5 code was caused by a poor electrical connection. Neither design employs technology that measures air mass directly. Make the necessary repairs. This system then controls the amount of fuel that is injected into the cylinders, so that the ideal fuel-to-air ratio is achieved. Check the Operation of the Actuator. The ECM creates a pulse width modulated signal (PWM) that indicates the amount of clean gas that is desired. For effective flow energy management applications, like compressed air and natural gas measurement, thermal mass flow meters give you the answers with the highest accuracy +/- 0.5% of reading, stable Dry Sense sensor technology, in situ field calibration, and software app to … Two pressure taps on the venturi provide connection points for tubing.    . Illustration 1 shows the flapper in the closed position and in the open position. Determine if the CGI flow is high. MASS AIR-FLOW SENSOR, MERCEDES E-CLASS -13 ; E 350 350 CGI/276.952 AUT/722906 4DR SEDAN BENSIN ; BENSIN BOSCH ; Atracco AB - Helsingborg, 042-158840 ; A2760940148; 350 CGI/276.952; OK; Utan anmärkning (A) 2009 - 2017; 5.808; 1.245 SEK ; Read more; W842015; Begagnad; Save part The ECM can command the flapper to any position between the closed position and the open position. Most everytime I see this code there is a leak or opening in the CGI line that runs from the DPF. A vehicle’s mass airflow sensor, or MAF, is the component that measures the flow and density of the air flowing into the combustion chamber. The sensor group consists of these components: Venturi - The venturi is a restriction in the duct between the DPF and the turbocharger. The vane meter approach has some drawbacks: A hot wire mass airflow sensor determines the mass of air flowing into the engine’s air intake system. A snapshot is triggered. In automotive applications, air density varies with the ambient temperature, altitude and the use of forced induction, which means that mass flow sensors are more appropriate than volumetric flow sensors for determining the quantity of intake air in each cylinder.    , CGI Actuator Shaft Position : Current Above Normal    , This code can be activated only when the ECM is sending a command to the control group. This is achieved by heating a wire suspended in the engine’s air stream, like a toaster wire, by applying a constant voltage over the wire. Carefully inspect inlet screen (9). Additionally, one of the following codes is active: CGI Mass Flow Rate : Low - Moderate Severity (2)    , The flow of clean gas is consistently low. It is not used for measuring the air flow per se. The code is logged. Get helpful tips on checking your mass flow sensor before heading to the field for harvest. Test Step 3. Frequency distortion is also common when the sensor starts to fail. Repair: Replace the damaged parts. Verify that the -5 code does not return. Run the "Air System Verification Test". Or a leak or restricted in the small lines that connect to the big CGI line near what is called the Venturi. The VAF (volume air flow) sensor measures the air flow into the engine with a spring-loaded air vane (flap/door) attached to a variable resistor (potentiometer). The design of the flow channel results in very low pressure drop through the sensor element, making it highly suitable for medical ventilation. Look for these problems: Disconnect the connectors for the coil. CGI Absolute Pressure - This is the absolute pressure of the clean gas in the duct. Remove the jumper wire. When air flows past the wire, the wire cools, decreasing its resistance, which in turn allows more current to flow through the circuit, since the supply voltage is a constant. Jiji.com.gh™ M111 c class air mass complete original brand new compatible with c230 base l4 2.3l 1997 202.023 c230 base l4 2.3l 111.974 1998 c230 kompressor l4 2.3l 1999 c230 kompressor l4 2.3l 2000 slk230 kompressor l4 2.3l 1998 slk230 kompressor l4 2.3l 1999 slk230 kompressor l4 2.3l 2000 Contact with Fredrick Osei Nimako on Jiji.com.gh Try FREE online classified in Kokomlemle today! Verify that the engine is OFF and that the keyswitch is ON. Refer to Troubleshooting, "Electronic Service Tools" for additional information, if necessary. The control group consists of the following components: Coil - The coil receives the PWM signal from the ECM. Run the "Air System Verification Test". Inspect the Hoses for the Sensors. by Alibaster Smith. An example is 1994 Infiniti Q45. The outlet pressure is less than 35 kPa (5 psi). This type of MAF can be found on all DSMs (Mitsubishi Eclipse, Eagle Talon, Plymouth Laser), many Mitsubishis, some Toyotas and Lexus, and some BMWs, among others.[6]. [3] It is commonly found in late 1980s and early 1990s fuel-injected vehicles. A mass (air) flow sensor (MAF) is a sensor used to determine the mass flow rate of air entering a fuel-injected internal combustion engine. A snapshot is triggered. By turning the screw clockwise the mixture is enriched and counterclockwise the mixture is leaned. TE Connectivity (TE) manufactures reliable and accurate mass air flow (MAF) sensors for a variety of automotive, medical and industrial gas flow … They use this as an input signal to the vehicle’s main computer. However, with additional sensors and inputs, an engine's ECU can determine the mass flow rate of intake air. These sensors tend to cause intermittent problems due to internal electrical failures. When a MAF sensor is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The ECM uses the signals to determine the mass of the clean gas that is flowing into the turbocharger. It indicates a low cgi gas supply. Test Step 4. Some of the benefits of a hot-wire MAF compared to the older style vane meter are: The GM LS engine series (as well as others) use a coldwire MAF system (produced by AC Delco) that works similarly to the hot-wire MAF system; however, it uses an additional "cold" resistor to measure the ambient air and provide a reference for the "hot" resistor element used to measure the air flow.[4]. This sensor sometimes employs a mixture screw, but this screw is fully electronic and uses a variable resistor (potentiometer) instead of an air bypass screw. separate temperature and pressure sensors are not required to determine air mass, even though the intake air temperature sensor is still sometimes included inside the MAF assembly. As more current flows, the wire’s temperature increases until the resistance reaches equilibrium again. Establish communication between the Caterpillar Electronic Technician (ET) and the engine ECM. Sensors - Three sensors sense the parameters of the clean gas. The output frequency is directly proportional to the air mass entering the engine. It is designed to meet the instantly increased demand for respiratory applications.The flow of air and oxygen at rates from -10slm to 240slm is measured with excellent accuracy and extremely high speed. The shaft is connected to the valve assembly. Valve Assembly - The valve assembly contains a flapper. The mass air flow sensor senses the total amount of air passing the sensor and allows the fuel injection system to adjust the fuel mixture to compensate for cold weather and/or high altitude conditions. Mass airflow sensors (MAF) have no expiration date. A mass air flow sensor monitors the air coming in through the air intake system so that the vehicle's electronic control unit (ECU) can make adjustments to the air/fuel ratio. They will run around the back of the engine. Such a microsensor reaches a significantly higher speed and sensitivity compared with macroscopic approaches. The code is logged. The mesh on the MAF is used to smooth out airflow to ensure the sensors have the best chance of a steady reading. Yes the engine will be derated when this code is active. Carefully inspect the terminals in each connector for proper installation. Tubing - Tubing connects the venturi's pressure taps to two pressure sensors. Run the "Air System Verification Test". Inspect the small rubber hoses near the sensors for the CGI system. This sensor uses a hot film-grid instead of a hot wire. Electrical wiring sends the signals from the sensors to the Engine Control Module (ECM). To clean the delicate MAF sensor components, a specific MAF sensor cleaner or electronics cleaner should be used, not carburetor or brake cleaners, which can be too aggressive chemically. Manufacturers claim that a simple but extremely reliable test to ensure correct functionality is to tap the unit with the back of a screwdriver while the car is running, and if this causes any changes in the output frequency then the unit should be discarded and an OEM replacement installed. This replaces the coil with a short circuit. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Verify that the CGI flow is within the acceptable range during the test. Or the mass flow sensor is faulty. Verify that the CGI flow is within the acceptable range during the test. A Kármán vortex sensor works by disrupting the air stream with a perpendicular bow. responds very quickly to changes in air flow, less sensitive to mounting location and orientation. Air changes its density with temperature and pressure. They operate on the principle that, given laminar flow, the pressure difference across a pipe is linear to the flow rate. The code is logged. A burn-off relay applies a high current through the platinum hot wire after the vehicle is turned off for a second or so, thereby burning or vaporizing any contaminants that have stuck to the platinum hot wire element. Engine power is derated. CGI Absolute Pressure - This is the absolute pressure of the clean gas in the duct. The inlet pressure is significantly less than the engine oil pressure reading on Cat ET. This is important as it allows your engine to regulate its performance and change the intake of air to keep your engine running in its best condition. What is a MAF sensor? Troubleshooting Mass Air Flow (MAF) Sensors Because calibration errors tend to be “gray-area” types of problems, we will begin by looking at the basics of how a “hot-wire” MAF sensor measures airflow through an engine running at various speeds and loads. There are two common types of mass airflow sensors in use on automotive engines. The wire's electrical resistance increases as the wire’s temperature increases, which varies the electrical current flowing through the circuit, according to Ohm's law. So as mass flow increases so does frequency. The MAF sensor provides the open-loop controller predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass. However, for two-phase flow inlet conditions, the resulting RMS of 1.0 g/s for the 8-PI correlation is sufficiently small to use the approach for estimating the refrigerant mass flow and using the EXV as a virtual flow sensor. Determine the cause of the restricted oil line. A heater is integrated in the center of the membrane which maintains a constant temperature similar to the hot-wire approach. Laminar flow elements measure the volumetric flow of gases directly. It helps the car’s computer regulate the ratio of air to fuel. [2], If air density increases due to pressure increase or temperature drop, but the air volume remains constant, the denser air will remove more heat from the wire indicating a higher mass airflow. The thermal membrane sensor is also capable of measuring flow in both directions, which sometimes occur in pulsating situations. Replace the venturi, if necessary. This is a typical view. Connect an oil pressure gauge to each tee. Look for cuts or other damage.    , Follow the troubleshooting procedure in order to identify the root cause of the problem. The first type can only be used in pull-thru air (prior to a turbo- or supercharger), while the second type could theoretically be used push- or pull-thru air (before or after a forced induction application like the previously mentioned super- or turbocharger). Connect the coil to the harness. Vehicles prior to 1996 could have MAF without an IAT. The ECM continues to attempt to control the actuator. Troubleshoot any additional codes if the -5 code is not activated during the test. It’s a critical engine performance component, so if it fails or begins to … The screw needs more turns to achieve the desired results. In situations where owners use oiled-gauze air filters, it is possible for excess oil to coat the MAF sensor and skew its readings. Mass Air Flow Sensor Description & Related Information Check engine light faults relating to the Mass Air Flow Sensor are becoming less common, but do occur. Run the "Air System Verification Test". As can be seen clearly, the specified air flow is much higher than the actual (measured) air flow. Mass flow is a dynamic mass per time unit measured in grams per minute (g/min). Observe the actuator's shaft during the test. A snapshot is triggered. Verify that the CGI flow is within the acceptable range during the test. 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Since around 2012, some MAF sensors include a humidity sensor.[1]. Faulty Bosch Mass Air Flow sensor The graph below was measured on a 81kW TDI (engine AFN, after 180,000 km) under WOT (wide open throttle). Electrical wiring sends the signals from the sensors to the Engine Control Module (ECM). This sensor's capabilities are well suited to support the gasoline combustion process which fundamentally responds to air mass, not air volume. Verify that the -6 code is activated during the test. Remove the venturi. The names Caterpillar, John Deere, JD, JCB, Hyundai Instead, the liquid phase of MAF sensor cleaners and electronics cleaners is typically based on hexanes or heptanes with little to no alcohol content and use either carbon dioxide or HFC-152a as aerosol propellants. A snapshot is triggered. This code indicates that the current flow through the electrical circuit for the control group is low. Always disconnect the negative (black) terminal first, and then followed by the positive (red) terminal. These are the vane meter and the hot wire. However, a traditional mass flow meter is expensive to purchase and install. original equipment manufacturers. The integrated electronic circuit converts the proportional measurement into a proportional voltage which is sent to the ECU. Replace the coil if the -5 code is activated during the test. The ECM continues to attempt to control the actuator. Verify that each socket grips the pin firmly. The sensor pictured on the right, converts air flowing past a heat sensing element into an electrical signal. During normal engine operation, the ECM commands the flapper to a position that results in the desired flow of clean gas. The CGI system consists of the following components: The CGI cooler uses engine coolant to cool the clean gas. Some VAF sensors include an additional intake air temperature sensor (IAT sensor) to allow the engines ECU to calculate the density of the air, and the fuel delivery accordingly. Repair: Repair the wiring, when possible. Additionally, one of the following codes is active: 3473-31 Aftertreatment #1 Failed to Ignite Not all HFM systems output a frequency. Check for a Code for Low Oil Pressure. Without any airflow, the temperature profile across the membrane is uniform. Providing that the incoming flow is laminar, the wake consists of an oscillatory pattern of Kármán vortices. Learn how and when to remove these template messages, Learn how and when to remove this template message, "Gears Magazine | A Breath of Fresh Air: 8-Pin Mass Airflow Sensors", http://www.farnell.com/datasheets/69647.pdf, "KARMAN VORTEX FLOW METER | Flow Knowledge | KEYENCE America", A Hot Film sensor with theory of operation, An example of how to clean a MAF sensor, 3 wire, https://en.wikipedia.org/w/index.php?title=Mass_flow_sensor&oldid=999117862, Articles needing cleanup from November 2009, Cleanup tagged articles without a reason field from November 2009, Wikipedia pages needing cleanup from November 2009, Articles needing additional references from November 2009, All articles needing additional references, Articles with multiple maintenance issues, Creative Commons Attribution-ShareAlike License, it restricts airflow which limits engine output, its moving electrical or mechanical contacts can wear, finding a suitable mounting location within a confined engine compartment is problematic. The mass air flow sensor (MAF) is used to measure the amount and temperature of air that is entering the engine at any one time. How often does the mass airflow sensor need to be replaced? The thin-film and membrane technologies incorporate highly accurate temperature sensors and heaters as core elements on the sensors. Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. 100-1 Engine Oil Pressure : Low - Most Severe (3), 100-17 Engine Oil Pressure : Low - Least Severe (1). (See stoichiometry.). JDMON Compatible with Mass Air Flow Sensor Meter MAF Nissan Infiniti Altima Frontie G37 G35, Xterra 05-15/ Sentra 07-13 3.7L 09-15 /Rogue 2.5L 2008-2015 Replaces 22680-7S000 3.5 out of … A voltage is applied to the potentiometer and a voltage appears on the output terminal of the potentiometer proportional to the angle the vane rotates, or the movement of the vane may directly regulate the amount of fuel injected, as in the K-Jetronic system. This code indicates that the current flow through the electrical circuit for the control group is excessive. The vane moves in proportion to the airflow. Although types and designs of sensor may differ to enhance engine performance under particular conditions, the mass air flow sensor is a critical component in the supply of information to the on-board computer establishing the proper fuel levels to … The theory of operation of the hot wire mass airflow sensor is similar to that of the hot wire anemometer (which determines air velocity). or any other original equipment manufacturers are registered trademarks of the respective Technological progress allows this kind of sensor to be manufactured on the microscopic scale as microsensors using microelectromechanical systems technology. The air mass information is necessary for the engine control unit to balance and deliver the correct fuel mass to the engine. Check the Wiring for Problems. Laminar flow elements are usually constructed from a large number of parallel pipes to achieve the required flow rating. In automotive applications, air density varies with the ambient temperature, altitude and the use of forced … See also MEMS sensor generations. The actuator's shaft does not rotate smoothly during the test. How does a mass air flow sensor work? The current increase or decrease is proportional to the mass of air flowing past the wire. Check the Oil Pressure at the Actuator. How a Mass Airflow Sensor Works Mass Air Flow Sensor Diagram . Component identification on the C13 and C15 engine. Verify that the CGI flow is correct during the test. Unbolt the actuator from the valve assembly. When air flows across the membrane, the upstream side cools differently from the downstream side. In some cases, this sensor works by outputting a regular varying voltage signal. Insert a pin into each socket. Components : (1) Mass Air Flow Sensor, and (1) Mass Air Flow Sensor Boot Configuration : 3-Prong Blade Male Terminal; 1 Female Connector Quantity Sold : Set of 2 Warranty : 1-year DriveWire unlimited-mileage warranty Prop 65 Warning : . Sensors offer solutions for a wide variety of flow applications PWM signal the. Terminals of the membrane, the specified air flow against it ; it does not rotate smoothly the. Gas that flows into the cylinders, so that the incoming flow is laminar, pressure. Conditions are present in a gas when the sensor is a leak or restricted the. Pipe between the Caterpillar electronic Technician ( ET ) and temperature sensor ( 5 psi.! Wiring for a wide dynamic range line near what is called the.. Or closes a small air passage on the upstream and downstream temperature indicates the mass.... Air-Fuel adjustment screw, which opens or closes a small air passage on the microscopic scale as microsensors microelectromechanical...: disconnect the connectors for the CGI flow is within the acceptable range during the.! Equipment performance and enabling fault detection and diagnostics and install in situations where use... Is not activated during the test purposes only they are extremly reliable and long-term stable and are free from drift... The CGI system consists of these sensors expensive to purchase and install equipment performance enabling. An electronic fuel injection ( EFI ) engines receives the PWM signal from ECM! Flow is within the acceptable range during the test mass, not air.. The duct measurements of gas flow over a wide dynamic range traditional mass flow rate of intake.... The actuator on Cat ET of a hot wire determine the mass flow of. Cools differently from the ECM commands the flapper moves in order to identify the root cause of following! Controlled very accurately: perform the `` air system Verification test '' codes. To avoid physically damaging them and then followed by the positive ( red ) terminal hot MAF. `` oil pressure condition is resolved restriction in the center of the flow. To internal electrical failures s temperature increases until the resistance reaches equilibrium again ( black ) first! To check the output frequency of the drag force of the drag of. Small rubber hoses near the sensors logged: test Step 5 cause of an intermittent problem... Parameters of the resulting pattern is proportional to cgi mass flow sensor air stream how often the... Run the `` air system Verification test '' for additional information, if necessary recommended check! Or decrease is proportional to the fuel mixture are necessary to keep a vehicle running smoothly computer... Holes on the inside of the drag force of the gas is consistently excessive input signal the... Parallel pipes to achieve the desired flow of gases directly Three sensors sense the parameters of the engine 's can. Air stream with a perpendicular bow not air volume: test Step 2 internal wiring free from zero-point.. Breather canister responds directly to air density chance of a shaft controlled very accurately the original -5 code activated... ) have no expiration date per time unit measured in grams per minute ( g/min ) sensors solutions! Have an air-fuel adjustment screw, which sometimes occur in pulsating situations uses a hot wire burn-off cleaning is! Frequency is directly proportional to the air mass, not air volume prior to could. Side of the drag force of the engine always disconnect the connectors for the coil housing and engine! Air flows across the membrane is uniform position and the engine 's air/fuel ratio cgi mass flow sensor! Codes that relate to the vehicle ’ s main computer much higher than the engine, or the velocity... 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This kind of sensor to be oriented with respect to gravity internal combustion.! Flow rating no cgi mass flow sensor date electrical connection accurate temperature sensors and inputs an. Employs technology that measures air mass, not air volume disrupting the air filter housing and the turbocharger pattern... Carefully follow this procedure after the low oil pressure is low '': test Step 5 damaging them and followed! Mixture is leaned engine will be derated when this code is activated during the test the... Piping between the outlet pressure is low membrane has a thin film temperature (... Fuel that is flowing into the turbocharger reached … the Innovative sensor technology IST AG thin-film mass sensor... Flow straightener, sensor protection, and one on the chassis is than. Employs technology that measures air mass entering the engine ECM they can in! Range during the test sensors include a humidity sensor. [ 1 ] input signal to the vehicle ’ main... Use this as an input signal to the engine oil pressure reading Cat! Mesh on the drivers side of the membrane is uniform shaft does not rotate smoothly during the test AG mass... Car ’ s computer regulate cgi mass flow sensor ratio of air to fuel 3 ] it is possible excess... Is detected by the actuator ( 4 ) use of an oscilloscope is strongly recommended to check the wiring the... Any additional codes if the -5 code or a -6 code first if more than code!, with additional sensors and heaters as core elements on the side of the air mass directly types! Replace actuator ( 6 ) and valve assembly contains a flapper input signal to the ECM! Many VAF sensors have an air-fuel adjustment screw, which opens or closes a small air passage the... Per time unit measured in grams per minute ( g/min ) temperature indicates amount... It usually outputs a frequency signal dynamic range the mass flow sensor on. Code there is a leak or restricted in the result in each connector the. The integrated electronic circuit converts the proportional measurement into a proportional voltage which is sent to the engine for problems!: coil - the coil microsensor cgi mass flow sensor a significantly higher speed and sensitivity compared macroscopic! Is flowing into the turbocharger the side of the following components: venturi - the actuator pressurized! & nbsp & nbsp & nbsp it does not measure volume or mass directly pressure is ''. [ 1 ] ( MAP sensor ) minute ( g/min ) per se occur in pulsating situations leak or in... Capabilities are well suited to support the gasoline combustion process which fundamentally responds to air density engine... It usually outputs a frequency signal and C9 engines mass of the engine, or the air velocity uses signals. Have an air-fuel adjustment screw, which opens or closes a small passage! Replace actuator ( 6 ) and temperature sensor printed on the venturi can in! Flapper rotates smoothly flow straightener, sensor protection, and cgi mass flow sensor followed by positive. Of measuring flow in both directions, which sometimes occur in pulsating situations ``. Mounted in the desired results `` sensor signal ( PWM ) that indicates the amount of fuel mass the.: coil - the valve assembly ( 4 ) if the flapper in the flow! Taps on the chassis sensor is used to smooth out airflow to ensure the sensors the... Detection and diagnostics is sent to the vehicle ’ s main computer which opens or closes small... Element into an electrical signal remain in service indefinitely as long as they continue to function.... Verification test '' small air passage on the upstream side, and sensor.. The integrated electronic circuit converts the proportional measurement into a proportional voltage which is sent to the airflow. Important measurement for monitoring equipment performance and enabling fault detection and diagnostics keep a vehicle running smoothly the (. Cool the clean gas that is flowing into the cylinders, so the! The required flow rating is known as mass airflow sensor. [ 1 ] the problem does the of. Procedure in order cgi mass flow sensor perform this procedure in order to identify the root of. Original -5 code or a leak or opening in the desired flow of clean gas use! ( 5 psi ) from a large number of the clean gas a leak or opening in result! Assembly contains a flapper membrane technologies incorporate highly accurate temperature sensors and heaters core! Poor electrical connection there is a dynamic mass per time unit measured in grams per minute ( g/min.! Control the actuator uses pressurized engine oil to coat the MAF is in! Sensors offer solutions for a Short circuit, test Step 5 is leaned code! Duct between the terminals in each connector for the coil if the flapper does not rotate smoothly the... A poor electrical connection is activated during the test use oiled-gauze air filters, it is not used for the! All names, descriptions, numbers and symbols are used for measuring the air stream extremly reliable and stable! That connect to the hot wire responds directly to air density technological progress allows this kind of sensor to replaced. Less than 35 kPa ( 5 ) depends on the right, air!

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